Harnessing Anti‐Parity‐Time Phase Transition in Coupled Topological Photonic Valley Waveguides

Author:

Xie Xinrong1234,Wei Maoliang1234,Yang Yumeng1234,Li Yuanzhen1234,Lei Kunhao1234,Zhang Zijian1234,Wang Chi1234,Zhong Chuyu1234,Li Lan5,Wang Zuojia1234,Sha Wei E. I.12,Li Erping12,Xue Haoran6,Yang Zhaoju17,Yuan Luqi8,Chen Hongsheng1234ORCID,Lin Hongtao1234ORCID,Gao Fei1234ORCID

Affiliation:

1. Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU‐Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China

2. International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China

3. Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China

4. Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China

5. Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou 310024 China

6. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

7. Department of Physics Zhejiang University Hangzhou 310027 China

8. State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

Abstract

AbstractTopological and non‐Hermitian physics provide powerful tools for manipulating light in different ways. Recently, intense studies have converged on the interplay between topology and non‐Hermiticity, and have produced fruitful results in various photonic settings. Currently, the realization of this interplay falls under the paradigm of enabling energy exchange between topological systems and the environment. Beyond this paradigm, it is revealed that a non‐Hermitian phenomenon, i.e., the anti‐parity‐time phase transition, naturally emerges from a Hermitian system realized by coupled topological valley waveguides. Such phase transition gives two exotic topological superstates in the spectral domain. By further combining the two phases with topological robustness, a photonic topological bi‐functional device is realized on a silicon‐on‐insulator platform at telecommunications frequencies. The results provide a new perspective on light manipulation and integrated device applications.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Natural Science Foundation of Zhejiang Province

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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